The main properties of experimental RFP magnetic profiles are reviewed and discussed in the context of relaxation theory. Relaxation phenomena under conditions of magnetic helicity conservation are a fundamental process determining both the formation and sustainment of the RFP magnetic distribution as well as plasma particle and energy confinement. In particular, the problem of magnetic helicity conservation both during the relaxation process and over longer timescales in driven systems is discussed. Relaxation mechanisms are reviewed and RFP dynamics is described in terms of cyclical diffusion, instability, and relaxation processes. Plasma relaxation interacts closely with heating and transport; its effects on ion heating and global confinement properties are discussed. Prospects including anticipated plasma performance in RFX are presented.
RFP磁場配位の実験的性質の主な特徴を、緩和理論の文脈で概観し議論する。磁気ヘリシティ保存の条件下での緩和現象は、RFP磁場分布の形成と維持、ならびにプラズマの粒子閉じ込めとエネルギー閉じ込めの両方を決定する基本過程である。特に、駆動された系における緩和過程およびより長い時間スケールでの磁気ヘリシティ保存の問題を考察する。緩和機構を概観し、RFPダイナミクスを循環的拡散、不安定性、緩和過程の観点から記述する。プラズマ緩和は加熱と輸送に密接に関連しており、その効果がイオン加熱と全体の閉じ込め特性に及ぼす影響を議論する。RFXにおける予想されるプラズマ性能を含む将来の見通しを示す。